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<FONT color="green">001</FONT>    /*<a name="line.1"></a>
<FONT color="green">002</FONT>     * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.2"></a>
<FONT color="green">003</FONT>     * contributor license agreements.  See the NOTICE file distributed with<a name="line.3"></a>
<FONT color="green">004</FONT>     * this work for additional information regarding copyright ownership.<a name="line.4"></a>
<FONT color="green">005</FONT>     * The ASF licenses this file to You under the Apache License, Version 2.0<a name="line.5"></a>
<FONT color="green">006</FONT>     * (the "License"); you may not use this file except in compliance with<a name="line.6"></a>
<FONT color="green">007</FONT>     * the License.  You may obtain a copy of the License at<a name="line.7"></a>
<FONT color="green">008</FONT>     *<a name="line.8"></a>
<FONT color="green">009</FONT>     *      http://www.apache.org/licenses/LICENSE-2.0<a name="line.9"></a>
<FONT color="green">010</FONT>     *<a name="line.10"></a>
<FONT color="green">011</FONT>     * Unless required by applicable law or agreed to in writing, software<a name="line.11"></a>
<FONT color="green">012</FONT>     * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.12"></a>
<FONT color="green">013</FONT>     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.13"></a>
<FONT color="green">014</FONT>     * See the License for the specific language governing permissions and<a name="line.14"></a>
<FONT color="green">015</FONT>     * limitations under the License.<a name="line.15"></a>
<FONT color="green">016</FONT>     */<a name="line.16"></a>
<FONT color="green">017</FONT>    <a name="line.17"></a>
<FONT color="green">018</FONT>    package org.apache.commons.math.analysis;<a name="line.18"></a>
<FONT color="green">019</FONT>    <a name="line.19"></a>
<FONT color="green">020</FONT>    import org.apache.commons.math.FunctionEvaluationException;<a name="line.20"></a>
<FONT color="green">021</FONT>    import org.apache.commons.math.util.FastMath;<a name="line.21"></a>
<FONT color="green">022</FONT>    <a name="line.22"></a>
<FONT color="green">023</FONT>    <a name="line.23"></a>
<FONT color="green">024</FONT>    /**<a name="line.24"></a>
<FONT color="green">025</FONT>     * Base class for {@link UnivariateRealFunction} that can be composed with other functions.<a name="line.25"></a>
<FONT color="green">026</FONT>     *<a name="line.26"></a>
<FONT color="green">027</FONT>     * @since 2.1<a name="line.27"></a>
<FONT color="green">028</FONT>     * @version $Revision: 1070725 $ $Date: 2011-02-15 02:31:12 +0100 (mar. 15 f??vr. 2011) $<a name="line.28"></a>
<FONT color="green">029</FONT>     */<a name="line.29"></a>
<FONT color="green">030</FONT>    public abstract class ComposableFunction implements UnivariateRealFunction {<a name="line.30"></a>
<FONT color="green">031</FONT>    <a name="line.31"></a>
<FONT color="green">032</FONT>        /** The constant function always returning 0. */<a name="line.32"></a>
<FONT color="green">033</FONT>        public static final ComposableFunction ZERO = new ComposableFunction() {<a name="line.33"></a>
<FONT color="green">034</FONT>            /** {@inheritDoc} */<a name="line.34"></a>
<FONT color="green">035</FONT>            @Override<a name="line.35"></a>
<FONT color="green">036</FONT>            public double value(double d) {<a name="line.36"></a>
<FONT color="green">037</FONT>                return 0;<a name="line.37"></a>
<FONT color="green">038</FONT>            }<a name="line.38"></a>
<FONT color="green">039</FONT>        };<a name="line.39"></a>
<FONT color="green">040</FONT>    <a name="line.40"></a>
<FONT color="green">041</FONT>        /** The constant function always returning 1. */<a name="line.41"></a>
<FONT color="green">042</FONT>        public static final ComposableFunction ONE = new ComposableFunction() {<a name="line.42"></a>
<FONT color="green">043</FONT>            /** {@inheritDoc} */<a name="line.43"></a>
<FONT color="green">044</FONT>            @Override<a name="line.44"></a>
<FONT color="green">045</FONT>            public double value(double d) {<a name="line.45"></a>
<FONT color="green">046</FONT>                return 1;<a name="line.46"></a>
<FONT color="green">047</FONT>            }<a name="line.47"></a>
<FONT color="green">048</FONT>        };<a name="line.48"></a>
<FONT color="green">049</FONT>    <a name="line.49"></a>
<FONT color="green">050</FONT>        /** The identity function. */<a name="line.50"></a>
<FONT color="green">051</FONT>        public static final ComposableFunction IDENTITY = new ComposableFunction() {<a name="line.51"></a>
<FONT color="green">052</FONT>            /** {@inheritDoc} */<a name="line.52"></a>
<FONT color="green">053</FONT>            @Override<a name="line.53"></a>
<FONT color="green">054</FONT>            public double value(double d) {<a name="line.54"></a>
<FONT color="green">055</FONT>                return d;<a name="line.55"></a>
<FONT color="green">056</FONT>            }<a name="line.56"></a>
<FONT color="green">057</FONT>        };<a name="line.57"></a>
<FONT color="green">058</FONT>    <a name="line.58"></a>
<FONT color="green">059</FONT>        /** The {@code FastMath.abs} method wrapped as a {@link ComposableFunction}. */<a name="line.59"></a>
<FONT color="green">060</FONT>        public static final ComposableFunction ABS = new ComposableFunction() {<a name="line.60"></a>
<FONT color="green">061</FONT>            /** {@inheritDoc} */<a name="line.61"></a>
<FONT color="green">062</FONT>            @Override<a name="line.62"></a>
<FONT color="green">063</FONT>            public double value(double d) {<a name="line.63"></a>
<FONT color="green">064</FONT>                return FastMath.abs(d);<a name="line.64"></a>
<FONT color="green">065</FONT>            }<a name="line.65"></a>
<FONT color="green">066</FONT>        };<a name="line.66"></a>
<FONT color="green">067</FONT>    <a name="line.67"></a>
<FONT color="green">068</FONT>        /** The - operator wrapped as a {@link ComposableFunction}. */<a name="line.68"></a>
<FONT color="green">069</FONT>        public static final ComposableFunction NEGATE = new ComposableFunction() {<a name="line.69"></a>
<FONT color="green">070</FONT>            /** {@inheritDoc} */<a name="line.70"></a>
<FONT color="green">071</FONT>            @Override<a name="line.71"></a>
<FONT color="green">072</FONT>            public double value(double d) {<a name="line.72"></a>
<FONT color="green">073</FONT>                return -d;<a name="line.73"></a>
<FONT color="green">074</FONT>            }<a name="line.74"></a>
<FONT color="green">075</FONT>        };<a name="line.75"></a>
<FONT color="green">076</FONT>    <a name="line.76"></a>
<FONT color="green">077</FONT>        /** The invert operator wrapped as a {@link ComposableFunction}. */<a name="line.77"></a>
<FONT color="green">078</FONT>        public static final ComposableFunction INVERT = new ComposableFunction () {<a name="line.78"></a>
<FONT color="green">079</FONT>            /** {@inheritDoc} */<a name="line.79"></a>
<FONT color="green">080</FONT>            @Override<a name="line.80"></a>
<FONT color="green">081</FONT>            public double value(double d){<a name="line.81"></a>
<FONT color="green">082</FONT>                return 1/d;<a name="line.82"></a>
<FONT color="green">083</FONT>            }<a name="line.83"></a>
<FONT color="green">084</FONT>        };<a name="line.84"></a>
<FONT color="green">085</FONT>    <a name="line.85"></a>
<FONT color="green">086</FONT>        /** The {@code FastMath.sin} method wrapped as a {@link ComposableFunction}. */<a name="line.86"></a>
<FONT color="green">087</FONT>        public static final ComposableFunction SIN = new ComposableFunction() {<a name="line.87"></a>
<FONT color="green">088</FONT>            /** {@inheritDoc} */<a name="line.88"></a>
<FONT color="green">089</FONT>            @Override<a name="line.89"></a>
<FONT color="green">090</FONT>            public double value(double d) {<a name="line.90"></a>
<FONT color="green">091</FONT>                return FastMath.sin(d);<a name="line.91"></a>
<FONT color="green">092</FONT>            }<a name="line.92"></a>
<FONT color="green">093</FONT>        };<a name="line.93"></a>
<FONT color="green">094</FONT>    <a name="line.94"></a>
<FONT color="green">095</FONT>        /** The {@code FastMath.sqrt} method wrapped as a {@link ComposableFunction}. */<a name="line.95"></a>
<FONT color="green">096</FONT>        public static final ComposableFunction SQRT = new ComposableFunction() {<a name="line.96"></a>
<FONT color="green">097</FONT>            /** {@inheritDoc} */<a name="line.97"></a>
<FONT color="green">098</FONT>            @Override<a name="line.98"></a>
<FONT color="green">099</FONT>            public double value(double d) {<a name="line.99"></a>
<FONT color="green">100</FONT>                return FastMath.sqrt(d);<a name="line.100"></a>
<FONT color="green">101</FONT>            }<a name="line.101"></a>
<FONT color="green">102</FONT>        };<a name="line.102"></a>
<FONT color="green">103</FONT>    <a name="line.103"></a>
<FONT color="green">104</FONT>        /** The {@code FastMath.sinh} method wrapped as a {@link ComposableFunction}. */<a name="line.104"></a>
<FONT color="green">105</FONT>        public static final ComposableFunction SINH = new ComposableFunction() {<a name="line.105"></a>
<FONT color="green">106</FONT>            /** {@inheritDoc} */<a name="line.106"></a>
<FONT color="green">107</FONT>            @Override<a name="line.107"></a>
<FONT color="green">108</FONT>            public double value(double d) {<a name="line.108"></a>
<FONT color="green">109</FONT>                return FastMath.sinh(d);<a name="line.109"></a>
<FONT color="green">110</FONT>            }<a name="line.110"></a>
<FONT color="green">111</FONT>        };<a name="line.111"></a>
<FONT color="green">112</FONT>    <a name="line.112"></a>
<FONT color="green">113</FONT>        /** The {@code FastMath.exp} method wrapped as a {@link ComposableFunction}. */<a name="line.113"></a>
<FONT color="green">114</FONT>        public static final ComposableFunction EXP = new ComposableFunction() {<a name="line.114"></a>
<FONT color="green">115</FONT>            /** {@inheritDoc} */<a name="line.115"></a>
<FONT color="green">116</FONT>            @Override<a name="line.116"></a>
<FONT color="green">117</FONT>            public double value(double d) {<a name="line.117"></a>
<FONT color="green">118</FONT>                return FastMath.exp(d);<a name="line.118"></a>
<FONT color="green">119</FONT>            }<a name="line.119"></a>
<FONT color="green">120</FONT>        };<a name="line.120"></a>
<FONT color="green">121</FONT>    <a name="line.121"></a>
<FONT color="green">122</FONT>        /** The {@code FastMath.expm1} method wrapped as a {@link ComposableFunction}. */<a name="line.122"></a>
<FONT color="green">123</FONT>        public static final ComposableFunction EXPM1 = new ComposableFunction() {<a name="line.123"></a>
<FONT color="green">124</FONT>            /** {@inheritDoc} */<a name="line.124"></a>
<FONT color="green">125</FONT>            @Override<a name="line.125"></a>
<FONT color="green">126</FONT>            public double value(double d) {<a name="line.126"></a>
<FONT color="green">127</FONT>                return FastMath.expm1(d);<a name="line.127"></a>
<FONT color="green">128</FONT>            }<a name="line.128"></a>
<FONT color="green">129</FONT>        };<a name="line.129"></a>
<FONT color="green">130</FONT>    <a name="line.130"></a>
<FONT color="green">131</FONT>        /** The {@code FastMath.asin} method wrapped as a {@link ComposableFunction}. */<a name="line.131"></a>
<FONT color="green">132</FONT>        public static final ComposableFunction ASIN = new ComposableFunction() {<a name="line.132"></a>
<FONT color="green">133</FONT>            /** {@inheritDoc} */<a name="line.133"></a>
<FONT color="green">134</FONT>            @Override<a name="line.134"></a>
<FONT color="green">135</FONT>            public double value(double d) {<a name="line.135"></a>
<FONT color="green">136</FONT>                return FastMath.asin(d);<a name="line.136"></a>
<FONT color="green">137</FONT>            }<a name="line.137"></a>
<FONT color="green">138</FONT>        };<a name="line.138"></a>
<FONT color="green">139</FONT>    <a name="line.139"></a>
<FONT color="green">140</FONT>        /** The {@code FastMath.atan} method wrapped as a {@link ComposableFunction}. */<a name="line.140"></a>
<FONT color="green">141</FONT>        public static final ComposableFunction ATAN = new ComposableFunction() {<a name="line.141"></a>
<FONT color="green">142</FONT>            /** {@inheritDoc} */<a name="line.142"></a>
<FONT color="green">143</FONT>            @Override<a name="line.143"></a>
<FONT color="green">144</FONT>            public double value(double d) {<a name="line.144"></a>
<FONT color="green">145</FONT>                return FastMath.atan(d);<a name="line.145"></a>
<FONT color="green">146</FONT>            }<a name="line.146"></a>
<FONT color="green">147</FONT>        };<a name="line.147"></a>
<FONT color="green">148</FONT>    <a name="line.148"></a>
<FONT color="green">149</FONT>        /** The {@code FastMath.tan} method wrapped as a {@link ComposableFunction}. */<a name="line.149"></a>
<FONT color="green">150</FONT>        public static final ComposableFunction TAN = new ComposableFunction() {<a name="line.150"></a>
<FONT color="green">151</FONT>            /** {@inheritDoc} */<a name="line.151"></a>
<FONT color="green">152</FONT>            @Override<a name="line.152"></a>
<FONT color="green">153</FONT>            public double value(double d) {<a name="line.153"></a>
<FONT color="green">154</FONT>                return FastMath.tan(d);<a name="line.154"></a>
<FONT color="green">155</FONT>            }<a name="line.155"></a>
<FONT color="green">156</FONT>        };<a name="line.156"></a>
<FONT color="green">157</FONT>    <a name="line.157"></a>
<FONT color="green">158</FONT>        /** The {@code FastMath.tanh} method wrapped as a {@link ComposableFunction}. */<a name="line.158"></a>
<FONT color="green">159</FONT>        public static final ComposableFunction TANH = new ComposableFunction() {<a name="line.159"></a>
<FONT color="green">160</FONT>            /** {@inheritDoc} */<a name="line.160"></a>
<FONT color="green">161</FONT>            @Override<a name="line.161"></a>
<FONT color="green">162</FONT>            public double value(double d) {<a name="line.162"></a>
<FONT color="green">163</FONT>                return FastMath.tanh(d);<a name="line.163"></a>
<FONT color="green">164</FONT>            }<a name="line.164"></a>
<FONT color="green">165</FONT>        };<a name="line.165"></a>
<FONT color="green">166</FONT>    <a name="line.166"></a>
<FONT color="green">167</FONT>        /** The {@code FastMath.cbrt} method wrapped as a {@link ComposableFunction}. */<a name="line.167"></a>
<FONT color="green">168</FONT>        public static final ComposableFunction CBRT = new ComposableFunction() {<a name="line.168"></a>
<FONT color="green">169</FONT>            /** {@inheritDoc} */<a name="line.169"></a>
<FONT color="green">170</FONT>            @Override<a name="line.170"></a>
<FONT color="green">171</FONT>            public double value(double d) {<a name="line.171"></a>
<FONT color="green">172</FONT>                return FastMath.cbrt(d);<a name="line.172"></a>
<FONT color="green">173</FONT>            }<a name="line.173"></a>
<FONT color="green">174</FONT>        };<a name="line.174"></a>
<FONT color="green">175</FONT>    <a name="line.175"></a>
<FONT color="green">176</FONT>        /** The {@code FastMath.ceil} method wrapped as a {@link ComposableFunction}. */<a name="line.176"></a>
<FONT color="green">177</FONT>        public static final ComposableFunction CEIL = new ComposableFunction() {<a name="line.177"></a>
<FONT color="green">178</FONT>            /** {@inheritDoc} */<a name="line.178"></a>
<FONT color="green">179</FONT>            @Override<a name="line.179"></a>
<FONT color="green">180</FONT>            public double value(double d) {<a name="line.180"></a>
<FONT color="green">181</FONT>                return FastMath.ceil(d);<a name="line.181"></a>
<FONT color="green">182</FONT>            }<a name="line.182"></a>
<FONT color="green">183</FONT>        };<a name="line.183"></a>
<FONT color="green">184</FONT>    <a name="line.184"></a>
<FONT color="green">185</FONT>        /** The {@code FastMath.floor} method wrapped as a {@link ComposableFunction}. */<a name="line.185"></a>
<FONT color="green">186</FONT>        public static final ComposableFunction FLOOR = new ComposableFunction() {<a name="line.186"></a>
<FONT color="green">187</FONT>            /** {@inheritDoc} */<a name="line.187"></a>
<FONT color="green">188</FONT>            @Override<a name="line.188"></a>
<FONT color="green">189</FONT>            public double value(double d) {<a name="line.189"></a>
<FONT color="green">190</FONT>                return FastMath.floor(d);<a name="line.190"></a>
<FONT color="green">191</FONT>            }<a name="line.191"></a>
<FONT color="green">192</FONT>        };<a name="line.192"></a>
<FONT color="green">193</FONT>    <a name="line.193"></a>
<FONT color="green">194</FONT>        /** The {@code FastMath.log} method wrapped as a {@link ComposableFunction}. */<a name="line.194"></a>
<FONT color="green">195</FONT>        public static final ComposableFunction LOG = new ComposableFunction() {<a name="line.195"></a>
<FONT color="green">196</FONT>            /** {@inheritDoc} */<a name="line.196"></a>
<FONT color="green">197</FONT>            @Override<a name="line.197"></a>
<FONT color="green">198</FONT>            public double value(double d) {<a name="line.198"></a>
<FONT color="green">199</FONT>                return FastMath.log(d);<a name="line.199"></a>
<FONT color="green">200</FONT>            }<a name="line.200"></a>
<FONT color="green">201</FONT>        };<a name="line.201"></a>
<FONT color="green">202</FONT>    <a name="line.202"></a>
<FONT color="green">203</FONT>        /** The {@code FastMath.log10} method wrapped as a {@link ComposableFunction}. */<a name="line.203"></a>
<FONT color="green">204</FONT>        public static final ComposableFunction LOG10 = new ComposableFunction() {<a name="line.204"></a>
<FONT color="green">205</FONT>            /** {@inheritDoc} */<a name="line.205"></a>
<FONT color="green">206</FONT>            @Override<a name="line.206"></a>
<FONT color="green">207</FONT>            public double value(double d) {<a name="line.207"></a>
<FONT color="green">208</FONT>                return FastMath.log10(d);<a name="line.208"></a>
<FONT color="green">209</FONT>            }<a name="line.209"></a>
<FONT color="green">210</FONT>        };<a name="line.210"></a>
<FONT color="green">211</FONT>    <a name="line.211"></a>
<FONT color="green">212</FONT>        /** The {@code FastMath.log1p} method wrapped as a {@link ComposableFunction}. */<a name="line.212"></a>
<FONT color="green">213</FONT>        public static final ComposableFunction LOG1P = new ComposableFunction () {<a name="line.213"></a>
<FONT color="green">214</FONT>            @Override<a name="line.214"></a>
<FONT color="green">215</FONT>            public double value(double d){<a name="line.215"></a>
<FONT color="green">216</FONT>                return FastMath.log1p(d);<a name="line.216"></a>
<FONT color="green">217</FONT>            }<a name="line.217"></a>
<FONT color="green">218</FONT>        };<a name="line.218"></a>
<FONT color="green">219</FONT>    <a name="line.219"></a>
<FONT color="green">220</FONT>        /** The {@code FastMath.cos} method wrapped as a {@link ComposableFunction}. */<a name="line.220"></a>
<FONT color="green">221</FONT>        public static final ComposableFunction COS = new ComposableFunction() {<a name="line.221"></a>
<FONT color="green">222</FONT>            /** {@inheritDoc} */<a name="line.222"></a>
<FONT color="green">223</FONT>            @Override<a name="line.223"></a>
<FONT color="green">224</FONT>            public double value(double d) {<a name="line.224"></a>
<FONT color="green">225</FONT>                return FastMath.cos(d);<a name="line.225"></a>
<FONT color="green">226</FONT>            }<a name="line.226"></a>
<FONT color="green">227</FONT>        };<a name="line.227"></a>
<FONT color="green">228</FONT>    <a name="line.228"></a>
<FONT color="green">229</FONT>        /** The {@code FastMath.abs} method wrapped as a {@link ComposableFunction}. */<a name="line.229"></a>
<FONT color="green">230</FONT>        public static final ComposableFunction ACOS = new ComposableFunction() {<a name="line.230"></a>
<FONT color="green">231</FONT>            /** {@inheritDoc} */<a name="line.231"></a>
<FONT color="green">232</FONT>            @Override<a name="line.232"></a>
<FONT color="green">233</FONT>            public double value(double d) {<a name="line.233"></a>
<FONT color="green">234</FONT>                return FastMath.acos(d);<a name="line.234"></a>
<FONT color="green">235</FONT>            }<a name="line.235"></a>
<FONT color="green">236</FONT>        };<a name="line.236"></a>
<FONT color="green">237</FONT>    <a name="line.237"></a>
<FONT color="green">238</FONT>        /** The {@code FastMath.cosh} method wrapped as a {@link ComposableFunction}. */<a name="line.238"></a>
<FONT color="green">239</FONT>        public static final ComposableFunction COSH = new ComposableFunction() {<a name="line.239"></a>
<FONT color="green">240</FONT>            /** {@inheritDoc} */<a name="line.240"></a>
<FONT color="green">241</FONT>            @Override<a name="line.241"></a>
<FONT color="green">242</FONT>            public double value(double d) {<a name="line.242"></a>
<FONT color="green">243</FONT>                return FastMath.cosh(d);<a name="line.243"></a>
<FONT color="green">244</FONT>            }<a name="line.244"></a>
<FONT color="green">245</FONT>        };<a name="line.245"></a>
<FONT color="green">246</FONT>    <a name="line.246"></a>
<FONT color="green">247</FONT>        /** The {@code FastMath.rint} method wrapped as a {@link ComposableFunction}. */<a name="line.247"></a>
<FONT color="green">248</FONT>        public static final ComposableFunction RINT = new ComposableFunction() {<a name="line.248"></a>
<FONT color="green">249</FONT>            /** {@inheritDoc} */<a name="line.249"></a>
<FONT color="green">250</FONT>            @Override<a name="line.250"></a>
<FONT color="green">251</FONT>            public double value(double d) {<a name="line.251"></a>
<FONT color="green">252</FONT>                return FastMath.rint(d);<a name="line.252"></a>
<FONT color="green">253</FONT>            }<a name="line.253"></a>
<FONT color="green">254</FONT>        };<a name="line.254"></a>
<FONT color="green">255</FONT>    <a name="line.255"></a>
<FONT color="green">256</FONT>        /** The {@code FastMath.signum} method wrapped as a {@link ComposableFunction}. */<a name="line.256"></a>
<FONT color="green">257</FONT>        public static final ComposableFunction SIGNUM = new ComposableFunction() {<a name="line.257"></a>
<FONT color="green">258</FONT>            /** {@inheritDoc} */<a name="line.258"></a>
<FONT color="green">259</FONT>            @Override<a name="line.259"></a>
<FONT color="green">260</FONT>            public double value(double d) {<a name="line.260"></a>
<FONT color="green">261</FONT>                return FastMath.signum(d);<a name="line.261"></a>
<FONT color="green">262</FONT>            }<a name="line.262"></a>
<FONT color="green">263</FONT>        };<a name="line.263"></a>
<FONT color="green">264</FONT>    <a name="line.264"></a>
<FONT color="green">265</FONT>        /** The {@code FastMath.ulp} method wrapped as a {@link ComposableFunction}. */<a name="line.265"></a>
<FONT color="green">266</FONT>        public static final ComposableFunction ULP = new ComposableFunction() {<a name="line.266"></a>
<FONT color="green">267</FONT>            /** {@inheritDoc} */<a name="line.267"></a>
<FONT color="green">268</FONT>            @Override<a name="line.268"></a>
<FONT color="green">269</FONT>            public double value(double d) {<a name="line.269"></a>
<FONT color="green">270</FONT>                return FastMath.ulp(d);<a name="line.270"></a>
<FONT color="green">271</FONT>            }<a name="line.271"></a>
<FONT color="green">272</FONT>        };<a name="line.272"></a>
<FONT color="green">273</FONT>    <a name="line.273"></a>
<FONT color="green">274</FONT>        /** Precompose the instance with another function.<a name="line.274"></a>
<FONT color="green">275</FONT>         * &lt;p&gt;<a name="line.275"></a>
<FONT color="green">276</FONT>         * The composed function h created by {@code h = g.of(f)} is such<a name="line.276"></a>
<FONT color="green">277</FONT>         * that {@code h.value(x) == g.value(f.value(x))} for all x.<a name="line.277"></a>
<FONT color="green">278</FONT>         * &lt;/p&gt;<a name="line.278"></a>
<FONT color="green">279</FONT>         * @param f function to compose with<a name="line.279"></a>
<FONT color="green">280</FONT>         * @return a new function which computes {@code this.value(f.value(x))}<a name="line.280"></a>
<FONT color="green">281</FONT>         * @see #postCompose(UnivariateRealFunction)<a name="line.281"></a>
<FONT color="green">282</FONT>         */<a name="line.282"></a>
<FONT color="green">283</FONT>        public ComposableFunction of(final UnivariateRealFunction f) {<a name="line.283"></a>
<FONT color="green">284</FONT>            return new ComposableFunction() {<a name="line.284"></a>
<FONT color="green">285</FONT>                @Override<a name="line.285"></a>
<FONT color="green">286</FONT>                /** {@inheritDoc} */<a name="line.286"></a>
<FONT color="green">287</FONT>                public double value(double x) throws FunctionEvaluationException {<a name="line.287"></a>
<FONT color="green">288</FONT>                    return ComposableFunction.this.value(f.value(x));<a name="line.288"></a>
<FONT color="green">289</FONT>                }<a name="line.289"></a>
<FONT color="green">290</FONT>            };<a name="line.290"></a>
<FONT color="green">291</FONT>        }<a name="line.291"></a>
<FONT color="green">292</FONT>    <a name="line.292"></a>
<FONT color="green">293</FONT>        /** Postcompose the instance with another function.<a name="line.293"></a>
<FONT color="green">294</FONT>         * &lt;p&gt;<a name="line.294"></a>
<FONT color="green">295</FONT>         * The composed function h created by {@code h = g.postCompose(f)} is such<a name="line.295"></a>
<FONT color="green">296</FONT>         * that {@code h.value(x) == f.value(g.value(x))} for all x.<a name="line.296"></a>
<FONT color="green">297</FONT>         * &lt;/p&gt;<a name="line.297"></a>
<FONT color="green">298</FONT>         * @param f function to compose with<a name="line.298"></a>
<FONT color="green">299</FONT>         * @return a new function which computes {@code f.value(this.value(x))}<a name="line.299"></a>
<FONT color="green">300</FONT>         * @see #of(UnivariateRealFunction)<a name="line.300"></a>
<FONT color="green">301</FONT>         */<a name="line.301"></a>
<FONT color="green">302</FONT>        public ComposableFunction postCompose(final UnivariateRealFunction f) {<a name="line.302"></a>
<FONT color="green">303</FONT>            return new ComposableFunction() {<a name="line.303"></a>
<FONT color="green">304</FONT>                @Override<a name="line.304"></a>
<FONT color="green">305</FONT>                /** {@inheritDoc} */<a name="line.305"></a>
<FONT color="green">306</FONT>                public double value(double x) throws FunctionEvaluationException {<a name="line.306"></a>
<FONT color="green">307</FONT>                    return f.value(ComposableFunction.this.value(x));<a name="line.307"></a>
<FONT color="green">308</FONT>                }<a name="line.308"></a>
<FONT color="green">309</FONT>            };<a name="line.309"></a>
<FONT color="green">310</FONT>        }<a name="line.310"></a>
<FONT color="green">311</FONT>    <a name="line.311"></a>
<FONT color="green">312</FONT>        /**<a name="line.312"></a>
<FONT color="green">313</FONT>         * Return a function combining the instance and another function.<a name="line.313"></a>
<FONT color="green">314</FONT>         * &lt;p&gt;<a name="line.314"></a>
<FONT color="green">315</FONT>         * The function h created by {@code h = g.combine(f, combiner)} is such that<a name="line.315"></a>
<FONT color="green">316</FONT>         * {@code h.value(x) == combiner.value(g.value(x), f.value(x))} for all x.<a name="line.316"></a>
<FONT color="green">317</FONT>         * &lt;/p&gt;<a name="line.317"></a>
<FONT color="green">318</FONT>         * @param f function to combine with the instance<a name="line.318"></a>
<FONT color="green">319</FONT>         * @param combiner bivariate function used for combining<a name="line.319"></a>
<FONT color="green">320</FONT>         * @return a new function which computes {@code combine.value(this.value(x), f.value(x))}<a name="line.320"></a>
<FONT color="green">321</FONT>         */<a name="line.321"></a>
<FONT color="green">322</FONT>        public ComposableFunction combine(final UnivariateRealFunction f,<a name="line.322"></a>
<FONT color="green">323</FONT>                                          final BivariateRealFunction combiner) {<a name="line.323"></a>
<FONT color="green">324</FONT>            return new ComposableFunction() {<a name="line.324"></a>
<FONT color="green">325</FONT>                @Override<a name="line.325"></a>
<FONT color="green">326</FONT>                /** {@inheritDoc} */<a name="line.326"></a>
<FONT color="green">327</FONT>                public double value(double x) throws FunctionEvaluationException {<a name="line.327"></a>
<FONT color="green">328</FONT>                    return combiner.value(ComposableFunction.this.value(x), f.value(x));<a name="line.328"></a>
<FONT color="green">329</FONT>                }<a name="line.329"></a>
<FONT color="green">330</FONT>            };<a name="line.330"></a>
<FONT color="green">331</FONT>        }<a name="line.331"></a>
<FONT color="green">332</FONT>    <a name="line.332"></a>
<FONT color="green">333</FONT>        /**<a name="line.333"></a>
<FONT color="green">334</FONT>         * Return a function adding the instance and another function.<a name="line.334"></a>
<FONT color="green">335</FONT>         * @param f function to combine with the instance<a name="line.335"></a>
<FONT color="green">336</FONT>         * @return a new function which computes {@code this.value(x) + f.value(x)}<a name="line.336"></a>
<FONT color="green">337</FONT>         */<a name="line.337"></a>
<FONT color="green">338</FONT>        public ComposableFunction add(final UnivariateRealFunction f) {<a name="line.338"></a>
<FONT color="green">339</FONT>            return new ComposableFunction() {<a name="line.339"></a>
<FONT color="green">340</FONT>                @Override<a name="line.340"></a>
<FONT color="green">341</FONT>                /** {@inheritDoc} */<a name="line.341"></a>
<FONT color="green">342</FONT>                public double value(double x) throws FunctionEvaluationException {<a name="line.342"></a>
<FONT color="green">343</FONT>                    return ComposableFunction.this.value(x) + f.value(x);<a name="line.343"></a>
<FONT color="green">344</FONT>                }<a name="line.344"></a>
<FONT color="green">345</FONT>            };<a name="line.345"></a>
<FONT color="green">346</FONT>        }<a name="line.346"></a>
<FONT color="green">347</FONT>    <a name="line.347"></a>
<FONT color="green">348</FONT>        /**<a name="line.348"></a>
<FONT color="green">349</FONT>         * Return a function adding a constant term to the instance.<a name="line.349"></a>
<FONT color="green">350</FONT>         * @param a term to add<a name="line.350"></a>
<FONT color="green">351</FONT>         * @return a new function which computes {@code this.value(x) + a}<a name="line.351"></a>
<FONT color="green">352</FONT>         */<a name="line.352"></a>
<FONT color="green">353</FONT>        public ComposableFunction add(final double a) {<a name="line.353"></a>
<FONT color="green">354</FONT>            return new ComposableFunction() {<a name="line.354"></a>
<FONT color="green">355</FONT>                @Override<a name="line.355"></a>
<FONT color="green">356</FONT>                /** {@inheritDoc} */<a name="line.356"></a>
<FONT color="green">357</FONT>                public double value(double x) throws FunctionEvaluationException {<a name="line.357"></a>
<FONT color="green">358</FONT>                    return ComposableFunction.this.value(x) + a;<a name="line.358"></a>
<FONT color="green">359</FONT>                }<a name="line.359"></a>
<FONT color="green">360</FONT>            };<a name="line.360"></a>
<FONT color="green">361</FONT>        }<a name="line.361"></a>
<FONT color="green">362</FONT>    <a name="line.362"></a>
<FONT color="green">363</FONT>        /**<a name="line.363"></a>
<FONT color="green">364</FONT>         * Return a function subtracting another function from the instance.<a name="line.364"></a>
<FONT color="green">365</FONT>         * @param f function to combine with the instance<a name="line.365"></a>
<FONT color="green">366</FONT>         * @return a new function which computes {@code this.value(x) - f.value(x)}<a name="line.366"></a>
<FONT color="green">367</FONT>         */<a name="line.367"></a>
<FONT color="green">368</FONT>        public ComposableFunction subtract(final UnivariateRealFunction f) {<a name="line.368"></a>
<FONT color="green">369</FONT>            return new ComposableFunction() {<a name="line.369"></a>
<FONT color="green">370</FONT>                @Override<a name="line.370"></a>
<FONT color="green">371</FONT>                /** {@inheritDoc} */<a name="line.371"></a>
<FONT color="green">372</FONT>                public double value(double x) throws FunctionEvaluationException {<a name="line.372"></a>
<FONT color="green">373</FONT>                    return ComposableFunction.this.value(x) - f.value(x);<a name="line.373"></a>
<FONT color="green">374</FONT>                }<a name="line.374"></a>
<FONT color="green">375</FONT>            };<a name="line.375"></a>
<FONT color="green">376</FONT>        }<a name="line.376"></a>
<FONT color="green">377</FONT>    <a name="line.377"></a>
<FONT color="green">378</FONT>        /**<a name="line.378"></a>
<FONT color="green">379</FONT>         * Return a function multiplying the instance and another function.<a name="line.379"></a>
<FONT color="green">380</FONT>         * @param f function to combine with the instance<a name="line.380"></a>
<FONT color="green">381</FONT>         * @return a new function which computes {@code this.value(x) * f.value(x)}<a name="line.381"></a>
<FONT color="green">382</FONT>         */<a name="line.382"></a>
<FONT color="green">383</FONT>        public ComposableFunction multiply(final UnivariateRealFunction f) {<a name="line.383"></a>
<FONT color="green">384</FONT>            return new ComposableFunction() {<a name="line.384"></a>
<FONT color="green">385</FONT>                @Override<a name="line.385"></a>
<FONT color="green">386</FONT>                /** {@inheritDoc} */<a name="line.386"></a>
<FONT color="green">387</FONT>                public double value(double x) throws FunctionEvaluationException {<a name="line.387"></a>
<FONT color="green">388</FONT>                    return ComposableFunction.this.value(x) * f.value(x);<a name="line.388"></a>
<FONT color="green">389</FONT>                }<a name="line.389"></a>
<FONT color="green">390</FONT>            };<a name="line.390"></a>
<FONT color="green">391</FONT>        }<a name="line.391"></a>
<FONT color="green">392</FONT>    <a name="line.392"></a>
<FONT color="green">393</FONT>        /**<a name="line.393"></a>
<FONT color="green">394</FONT>         * Return a function scaling the instance by a constant factor.<a name="line.394"></a>
<FONT color="green">395</FONT>         * @param scaleFactor constant scaling factor<a name="line.395"></a>
<FONT color="green">396</FONT>         * @return a new function which computes {@code this.value(x) * scaleFactor}<a name="line.396"></a>
<FONT color="green">397</FONT>         */<a name="line.397"></a>
<FONT color="green">398</FONT>        public ComposableFunction multiply(final double scaleFactor) {<a name="line.398"></a>
<FONT color="green">399</FONT>            return new ComposableFunction() {<a name="line.399"></a>
<FONT color="green">400</FONT>                @Override<a name="line.400"></a>
<FONT color="green">401</FONT>                /** {@inheritDoc} */<a name="line.401"></a>
<FONT color="green">402</FONT>                public double value(double x) throws FunctionEvaluationException {<a name="line.402"></a>
<FONT color="green">403</FONT>                    return ComposableFunction.this.value(x) * scaleFactor;<a name="line.403"></a>
<FONT color="green">404</FONT>                }<a name="line.404"></a>
<FONT color="green">405</FONT>            };<a name="line.405"></a>
<FONT color="green">406</FONT>        }<a name="line.406"></a>
<FONT color="green">407</FONT>        /**<a name="line.407"></a>
<FONT color="green">408</FONT>         * Return a function dividing the instance by another function.<a name="line.408"></a>
<FONT color="green">409</FONT>         * @param f function to combine with the instance<a name="line.409"></a>
<FONT color="green">410</FONT>         * @return a new function which computes {@code this.value(x) / f.value(x)}<a name="line.410"></a>
<FONT color="green">411</FONT>         */<a name="line.411"></a>
<FONT color="green">412</FONT>        public ComposableFunction divide(final UnivariateRealFunction f) {<a name="line.412"></a>
<FONT color="green">413</FONT>            return new ComposableFunction() {<a name="line.413"></a>
<FONT color="green">414</FONT>                @Override<a name="line.414"></a>
<FONT color="green">415</FONT>                /** {@inheritDoc} */<a name="line.415"></a>
<FONT color="green">416</FONT>                public double value(double x) throws FunctionEvaluationException {<a name="line.416"></a>
<FONT color="green">417</FONT>                    return ComposableFunction.this.value(x) / f.value(x);<a name="line.417"></a>
<FONT color="green">418</FONT>                }<a name="line.418"></a>
<FONT color="green">419</FONT>            };<a name="line.419"></a>
<FONT color="green">420</FONT>        }<a name="line.420"></a>
<FONT color="green">421</FONT>    <a name="line.421"></a>
<FONT color="green">422</FONT>        /**<a name="line.422"></a>
<FONT color="green">423</FONT>         * Generates a function that iteratively apply instance function on all<a name="line.423"></a>
<FONT color="green">424</FONT>         * elements of an array.<a name="line.424"></a>
<FONT color="green">425</FONT>         * &lt;p&gt;<a name="line.425"></a>
<FONT color="green">426</FONT>         * The generated function behaves as follows:<a name="line.426"></a>
<FONT color="green">427</FONT>         * &lt;ul&gt;<a name="line.427"></a>
<FONT color="green">428</FONT>         *   &lt;li&gt;initialize result = initialValue&lt;/li&gt;<a name="line.428"></a>
<FONT color="green">429</FONT>         *   &lt;li&gt;iterate: {@code result = combiner.value(result,<a name="line.429"></a>
<FONT color="green">430</FONT>         *   this.value(nextMultivariateEntry));}&lt;/li&gt;<a name="line.430"></a>
<FONT color="green">431</FONT>         *   &lt;li&gt;return result&lt;/li&gt;<a name="line.431"></a>
<FONT color="green">432</FONT>         * &lt;/ul&gt;<a name="line.432"></a>
<FONT color="green">433</FONT>         * &lt;/p&gt;<a name="line.433"></a>
<FONT color="green">434</FONT>         * @param combiner combiner to use between entries<a name="line.434"></a>
<FONT color="green">435</FONT>         * @param initialValue initial value to use before first entry<a name="line.435"></a>
<FONT color="green">436</FONT>         * @return a new function that iteratively apply instance function on all<a name="line.436"></a>
<FONT color="green">437</FONT>         * elements of an array.<a name="line.437"></a>
<FONT color="green">438</FONT>         */<a name="line.438"></a>
<FONT color="green">439</FONT>        public MultivariateRealFunction asCollector(final BivariateRealFunction combiner,<a name="line.439"></a>
<FONT color="green">440</FONT>                                                    final double initialValue) {<a name="line.440"></a>
<FONT color="green">441</FONT>            return new MultivariateRealFunction() {<a name="line.441"></a>
<FONT color="green">442</FONT>                /** {@inheritDoc} */<a name="line.442"></a>
<FONT color="green">443</FONT>                public double value(double[] point)<a name="line.443"></a>
<FONT color="green">444</FONT>                    throws FunctionEvaluationException, IllegalArgumentException {<a name="line.444"></a>
<FONT color="green">445</FONT>                    double result = initialValue;<a name="line.445"></a>
<FONT color="green">446</FONT>                    for (final double entry : point) {<a name="line.446"></a>
<FONT color="green">447</FONT>                        result = combiner.value(result, ComposableFunction.this.value(entry));<a name="line.447"></a>
<FONT color="green">448</FONT>                    }<a name="line.448"></a>
<FONT color="green">449</FONT>                    return result;<a name="line.449"></a>
<FONT color="green">450</FONT>                }<a name="line.450"></a>
<FONT color="green">451</FONT>            };<a name="line.451"></a>
<FONT color="green">452</FONT>        }<a name="line.452"></a>
<FONT color="green">453</FONT>    <a name="line.453"></a>
<FONT color="green">454</FONT>        /**<a name="line.454"></a>
<FONT color="green">455</FONT>         * Generates a function that iteratively apply instance function on all<a name="line.455"></a>
<FONT color="green">456</FONT>         * elements of an array.<a name="line.456"></a>
<FONT color="green">457</FONT>         * &lt;p&gt;<a name="line.457"></a>
<FONT color="green">458</FONT>         * Calling this method is equivalent to call {@link<a name="line.458"></a>
<FONT color="green">459</FONT>         * #asCollector(BivariateRealFunction, double) asCollector(BivariateRealFunction, 0.0)}.<a name="line.459"></a>
<FONT color="green">460</FONT>         * &lt;/p&gt;<a name="line.460"></a>
<FONT color="green">461</FONT>         * @param combiner combiner to use between entries<a name="line.461"></a>
<FONT color="green">462</FONT>         * @return a new function that iteratively apply instance function on all<a name="line.462"></a>
<FONT color="green">463</FONT>         * elements of an array.<a name="line.463"></a>
<FONT color="green">464</FONT>         * @see #asCollector(BivariateRealFunction, double)<a name="line.464"></a>
<FONT color="green">465</FONT>         */<a name="line.465"></a>
<FONT color="green">466</FONT>        public  MultivariateRealFunction asCollector(final BivariateRealFunction combiner) {<a name="line.466"></a>
<FONT color="green">467</FONT>            return asCollector(combiner, 0.0);<a name="line.467"></a>
<FONT color="green">468</FONT>        }<a name="line.468"></a>
<FONT color="green">469</FONT>    <a name="line.469"></a>
<FONT color="green">470</FONT>        /**<a name="line.470"></a>
<FONT color="green">471</FONT>         * Generates a function that iteratively apply instance function on all<a name="line.471"></a>
<FONT color="green">472</FONT>         * elements of an array.<a name="line.472"></a>
<FONT color="green">473</FONT>         * &lt;p&gt;<a name="line.473"></a>
<FONT color="green">474</FONT>         * Calling this method is equivalent to call {@link<a name="line.474"></a>
<FONT color="green">475</FONT>         * #asCollector(BivariateRealFunction, double) asCollector(BinaryFunction.ADD, initialValue)}.<a name="line.475"></a>
<FONT color="green">476</FONT>         * &lt;/p&gt;<a name="line.476"></a>
<FONT color="green">477</FONT>         * @param initialValue initial value to use before first entry<a name="line.477"></a>
<FONT color="green">478</FONT>         * @return a new function that iteratively apply instance function on all<a name="line.478"></a>
<FONT color="green">479</FONT>         * elements of an array.<a name="line.479"></a>
<FONT color="green">480</FONT>         * @see #asCollector(BivariateRealFunction, double)<a name="line.480"></a>
<FONT color="green">481</FONT>         * @see BinaryFunction#ADD<a name="line.481"></a>
<FONT color="green">482</FONT>         */<a name="line.482"></a>
<FONT color="green">483</FONT>        public  MultivariateRealFunction asCollector(final double initialValue) {<a name="line.483"></a>
<FONT color="green">484</FONT>            return asCollector(BinaryFunction.ADD, initialValue);<a name="line.484"></a>
<FONT color="green">485</FONT>        }<a name="line.485"></a>
<FONT color="green">486</FONT>    <a name="line.486"></a>
<FONT color="green">487</FONT>        /**<a name="line.487"></a>
<FONT color="green">488</FONT>         * Generates a function that iteratively apply instance function on all<a name="line.488"></a>
<FONT color="green">489</FONT>         * elements of an array.<a name="line.489"></a>
<FONT color="green">490</FONT>         * &lt;p&gt;<a name="line.490"></a>
<FONT color="green">491</FONT>         * Calling this method is equivalent to call {@link<a name="line.491"></a>
<FONT color="green">492</FONT>         * #asCollector(BivariateRealFunction, double) asCollector(BinaryFunction.ADD, 0.0)}.<a name="line.492"></a>
<FONT color="green">493</FONT>         * &lt;/p&gt;<a name="line.493"></a>
<FONT color="green">494</FONT>         * @return a new function that iteratively apply instance function on all<a name="line.494"></a>
<FONT color="green">495</FONT>         * elements of an array.<a name="line.495"></a>
<FONT color="green">496</FONT>         * @see #asCollector(BivariateRealFunction, double)<a name="line.496"></a>
<FONT color="green">497</FONT>         * @see BinaryFunction#ADD<a name="line.497"></a>
<FONT color="green">498</FONT>         */<a name="line.498"></a>
<FONT color="green">499</FONT>        public  MultivariateRealFunction asCollector() {<a name="line.499"></a>
<FONT color="green">500</FONT>            return asCollector(BinaryFunction.ADD, 0.0);<a name="line.500"></a>
<FONT color="green">501</FONT>        }<a name="line.501"></a>
<FONT color="green">502</FONT>    <a name="line.502"></a>
<FONT color="green">503</FONT>        /** {@inheritDoc} */<a name="line.503"></a>
<FONT color="green">504</FONT>        public abstract double value(double x) throws FunctionEvaluationException;<a name="line.504"></a>
<FONT color="green">505</FONT>    <a name="line.505"></a>
<FONT color="green">506</FONT>    }<a name="line.506"></a>




























































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